Insxtlatob cap



E. J. MCILVRIED INSULTOR CAP l April 2, 1929.

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INSULATOR CAP Filed June 12, 1925 4 Sheets-Sheet 2k APT 2 1929- E. J; MolLvRlED 1,707,489

` l INSULATOR CAP Filed June 12, 1925 l 4 sheets-sheet 5 hfls #Harney Patented Apr. 2, i929.

UNITED STATES EDWIN J'. MCILVR-IED, OF BAY VILLAGE, OHIO.

INSULATOR CAP.

Application filed .Tune 12, 1925.

This invention relates to improvements in the art of making insulator caps adapted to be employed in supporting high tension conductors, and pertains more especially to an improved process of making an insulator cap h ving means at the top thereof for a supporting connection and also having means for engaging and supporting cement which secures the head of an insulator` within the cap.

l am aware that cast metal insulator caps have heretofore been made, and also that insulator caps have been made from blank metal bars by forging, punching, metal-extrudmg and bending operations.

The manufacture of an insulator cap from a blank metal bar requires operations which incur much and rapid wear and tear on the tools or apparatus employed in the forging of said bar into the form of said cap and renders the apparatus short-lived and thereby enhances the cost of manufacture of the cap.

@ne object of my invention is to devise an improved process which is not only highly practical for the production of an insulator cap superior to and more reliable than a cast metal cap but which does not involve the use of a blank bar and minimizes the wear and tear on the apparatus employed in carrying out said process.

Another object to devise a process whercby the formation of cracks. orifices or pores in the bell-shaped body of the cap and other detrin'iental or objectionable defects are positively prevented. n

Another object is to facilitate the econonncal manufacture of the desired insulator cap from a piece of tubular metal stock.

With these objects in view. and to attain other objects hereinafter appearing, this in-v vention consi, f in the improved steps or process hereinafter described and pointed out in the claims. y

ln the accolnpanying drawings.. Figure 1 i vertical section of a tubular shell 1 Aed to be operated on, as will hereinafter r, for the production of the desired inlator cap and having opposite end portions e i unequal in diameter. Fig. 2 is a top plan i. relation to Fig. 1. Fig. 3 is a bottom plan relation te Fig. 1. Fig. 4 is a central vertical section of a set of dies for operating on 'the bereinbefore mentioned shell which is shone suitably positioned. in Fig. 4, in

Serial No. 36,639.

relation to said dies. Fig. 5 is a side View, largely in central section, showing said shell confined for operation thereon by said dies. Fig. 6 is a bottom View of the movable dies illustrated in the upper portion of Fig. 4. Fig. 7 is a top plan'of the die illustrated in the lower portion of Fig. 4. Fig. 8 is a side View, largely in section, illustrating the forging, by said dies, of a transverse partition adjacent the inner end of the diametrically smaller end portion and internally of the hereinbefore mentioned shell. Fig. 9 is a central horizontal section of a pair of horizontal dies for operating on the partitioned shell shown held between said dies. and shows a portion of a movable die for subsequently entering said shell at the diametrically larger end portion of the shell. Fig. 10 is a vertical section taken along line 10-10 in Fig. 9. Fig. 11 is a view illustrative of the inner side of a die of the pair of dies illustrated in Fig. 9. Fig. 12 is a right-hand end view in relation to Fig. 11. Fig. 13 is a central horizontal section showing the dies ofthe pair of dies illustrated. in Fig. 9 as closed together and as having operated on the diametrically smaller end portion of the partitioned shell, and the shell-.entering die adjacent said pair of dies is shown, in Fig. 13, as in position to enter said shell. Fig. 14 is a vertical section taken along line 14-14 in Fig. 13. Fig. 15 is a vertical section taken along line 15-15 in Fig. 14. Fig. 16 is a central horizontal section illustrative of the cooperation of the dies illustrated in Fig. 13. Fig. 17 is a vertical section taken along line 17-17 in Fig. 16. Fig. 18 is a vertical section taken along line 18H18 in Fig. 17. Fig. v19 is a central vertical sect-ion of the partitioned shell formed by the operation of the hereinbeforc meutioned dies on the tubular shell shown in Figs. 1. 2. 3, 4 and 5, and shows said shell in an upright position and also shows the completion of the bell-shaped body of an insulator cap. Fig. 2O is a central vertical section illustrative of trimming operations to be performed on the upper and diametrically smaller end portion of the shell shown in Fig. 19. Fig. 21 is a vertical section taken along line 21-21 in 20. Fig. 22 is a central vertical section of a finished insulator cap made bv .my iinproved process. Fig. 23 is a central vertical section taken along line 22,-22 n l., and

shown said liuished cap applied to the head of an insulator. Y Portions are broken au'ay in tbe drawings to reduce tlieir size.

ln said dra-wings, Figs. l, 2 and 3 illustrate a tubular inet-al sliell A preferably made of Steel and adapted to be operated on, as uill hereinafter appeaigto produce mthe desired insulator cap. One end portion 25 of said Shell is dianietrically sniallerinternally and externally than and substantially in line endwise with its other and diametrirally larger end portion 2li, and said shell is proferal'ly Substantially circular externally and internally from end to end. he larger r end portion F26 of said shell preferably measures ronaiderably more, botli in external and internal diameter, than the Smaller end pon tion uhieli is adapted to be operated on, as will hereimifter appear, lo participate in the foruiation of the topiof the bell-shal'ied body of theeap to be produced as well as to form a supporting connection for Said top, and said shell is Shown as comprisiin an interniediete portion Q7 which flares from the inner end of the smaller end portion 25 toward tbe lzirirer end portion 2li, and said portions 26 and 2'( are adapted to participate in the formation of said body of said cap. 'lllie larger end portion QG of the Shell A is preferably substantially uniform in thickness from end to end. The smaller end portion of Said shell is preferably substantially uniform in tliieknese from end to end and thicker than the larger end portion 2G. rlllie intermediate portion 27 of the shell A preferaliily increases in tliielinesa from the larger" end portion 2G to the smaller end portion 25. The sn'ialler end portion 25 and the intermediate portion 27 of the shell. A are produced hot to reiuler tbern suitable for subjection to foraine' rmeratious` and the diametrieally larger end portion ie preferably comparatively eool.

rlhe lehell fr illuetrated in Figs. l, 2 and 3 ia preferably produced by the required forge ingr operutiona ou a hot steel tube whieh iu uniform in diameter from end to end and measures about the salue in lenejtli au said shell il and about the naine in diameter and tbirlner-is an tbe larger end portion QG of said sliell. and said tube inelferably ('oni' of a piero out from tubular oielal Steek wliirh luezusures :substantially the salue in diameter and tbielnuee` ae :laid larger end portion of said aliell.

'lbe eliell .de baring been priuliuedA` is mounted (see llipg. 41) ou the bottom die B of a eet of three steel dies1 and tlie other two dien C und li) of uuid set of dies are movable vertically and shown, in Fig. 4l, as spaced upwardly from the relatively stationary die A.

The bottom die B t see Figs, 4l and 7) com prises a Substantially vertieal steel body 2Q having a circular base 30 rendered stationary mir/,1189

in any approved manner, and said. body (eee Figs. 5 and 7) is circular from said base to its upper extremity, and externally pri'ivided, at its lower end portion (eee Figa. 4t, 5 and 7) with an upwardly facing;` horizontal shoulder 3l forming a Seat for tlie end face of the dianii'itrically .lar-iger end portion 2G of the shell A. llllie upper portion ot the die-body QS) taperii upwardly, 32, to conform to the internal surface of the intermediate portion 2T of the ebell il, and said body is substantially uniform in external diameter between said tapering portion and the shoulder 3l. l`he die-body bas a central hole 33 extending( vertically tl'irougli @aid body, and the upper end portion 3&1- olsaid hole tial-eeA up Wardly at its upper end, ae Shown in r A 4l 4to forni a seat for the bead 8G of a work-ejecting rod 35 engaging Said hole and adapted to be operated in any approved manner. 'lhe bead 36 lies an upper conical portion 3'? the cireuniferential Sau-face of which is flush with the circinirlerential aurfare of the tapering portion 32 of the diebody 29, and said portion of Said head therefore forms an upward extension ot Said tapering portion of Said body and conforms to the diametricallv smaller portion of the internal. surface of tlie intermediate portion 2l' of" tbe shellll.

ln l? el tbe ahell il is shown seated, at the end fare of ite diau'ietrically larger end portion Q6, on the shoulder 8l, and Said por tion oteaid Shell embraces, the body Q9 of the die 'il below the tapering portion 32 of said body, and the intermediate portion of eaid shell en'ibraees said tapering; portion of .said body and the conical portion 37 of the head 3G, and the dian'lftrically Smaller end portion of said Sliell is; Substantially Wholly above .ea-id die. l

The two movable diesy C and D of the set of dios sbown in lila. l are diopoeed the one l? around the other C and externally eireular in end view as shorvil in Figi. (L and the inner die (l of raid movable dies is a solid vertical cylindrical body in line endwise with lille relatively fflationary die ll. rllhe dies (l and l) are movable end u'iee independently of eacli other or to; 'ellier and the outer die l) of said movable dies eonsiats ot a vertically die posed annular bleek which hasl a louer oud portion 35S arranged and internallv Sized as required lo eoniplctrl v embrace the larger end portion E36 ol tbe shell .it When Huid ahell has been seated on tbe elioulder 3l. aliown in Fien. Aland ln Fig. 5 the loner end portion 3S of the annular movable die D ia sisliovfn as einbraeine` the larig'er end portion 2G of tbe seated eliell il` and l@aid die han4 a do\vn- Wardly flaring` internal Surface 39 errtendine upwardly from the lower end portion 38 of said die and shown, in Figi', aa extending; from end to end and eloaely and conipletely embracing and conforming to the intermediate portion 27 of said shell. Also, the

liu

is; Fox-med :it tbe imei.' wide m :mui in miti be e by between tbe top omiv t bottom o tbe (be sind between tbe .iimtementiooed end. o'i the die zizia, smid. lugs :md Spiieoe From the top and bottoio oi tbe die :md exten e l eafd logge 'tovfmfd mid zzet-iiifmtiomeci i of tbe .f be Home vbnt ie: tbm beit tbe distance between miti em] ot tbe be md Solft lugi'o. 'lfb o l'aeew f eff 51 in tbe li f' f' 1y o ppow e mob tween tbe top :md bottoni tending' to tbe bist-mm:timed m i# i'zom tbe ree/om W 'Il (be ees 52 in (HM "G vire mi'eety (appetite web otbelx tu dotted been in 9 tbe pmtitiooezi shell it; Si been eeturftefi bitii'ziibf towv iii-f into tbe f 'zvvitjf 4:8 :zwi wow-is z,V i i1 fr be H. '.fbo ing; 53() ot web oie of t A mi? of (ii-ef; f4' z mi mougggb operi; to pro s-'nimlier omi pmytion bx; (biting tbe offtuazti, i

:md :Nimmt tbe` e .i m tbe me?, G' miti H have tbe arrangement :me

@mentions required to offeoiim'mflnte tbe iofeion o? the Sbeil-eopjngiim; member E m il tbe die (i bzw. been iuflow gninet tbey die 1 7.213 mui 15.r @be ieeeefae as eiiovfn in (S met. 9 f2) :we (i md wir tbm tbe reeef at; o2. The 5l in en mi Deneuve@ 3^' die o'f tbe peil of dief: (f

ti-om @mi to end time tbe smaller end po 9.5 o? tbe paititioued fsbeb to be operante/ el 1 i y mid (bet. muniti ebelt? Wb. i Vt bm; parte? by entered tbe etetsomvy ibo .iT-i. of; sbo m it one@ with tbe dotted boef@ in .bien 9., is poe outer emi of its1 #metier en poi-tion 'n tbe imm' om! o s, in eaifi die.

oit tbe you' ot (bei ''be Verme in web :ibo (tomi it (we Figi. i

me :i depth wbieb met mee les tbm belt" be diemwtei' ot tbe einem@ emi member Q5 of tbe imvftit (meti mbe betete tbe opmnitiow on si d rib( by tbm'omfe tbe laterally billig agi-.i o' mid ihoeewem rbu'iu tbe neto t e die H towm'd mirri minimi; the fiie E mi@ member Q5 Wbi between t E :mii smid t :maxim-:t tbe bitmziib tm-ingr Sides. of seid nirmbei' t@ a mi tbm'eby Hutten miti poi'timif-s o i mid mob bei: if, :ne: :'-zbfm'm in bien lf3 11 mi. it anni r1; '1i my: b to pei'- iiit (i'lwpbieom .zot nl etzti` :is it 1i fi;

i nml i5, town-(t tbe top :iwi bottom weibl; of :saliti Veenema during; mid operation of Suid dies.

The (mfitiet: It?, in the @im Gr and H (See Fig. E) we burge ei'iouggb in dimensions to permit dirzimetirieei o1* ti'zii'isveise Ulizmfion oit tbe bu'gm' end poi-tion 2G :msi iiiei'iuedmte portion 2T of tbe partitioned el eil when the n ln.

moe/,fito

sumiiei emi poi-tion of Said Shell has been flattened. /Wiile Said sbeil is eonned by tbe and H stiftet the iottening of seid om: Het" end potioi of said shell a, movable die adapted to be employed in expanding (t oe j n u tbe 1m ,e1f end ootion 26 and intermediate d .1. W Lottum oit sind ebeli and shown m if 1g. 13

,il (bn wily mounds the pmtitioned eb il iii-o o ,fu-11d pmftition to the outer end of tbe di:m'ieii :aiiy larger emi portion of tbe tabel?. i ogni?. et tbe Walle of said cavities?.

(Fbviouely t e bereit-ion 312 oine: ay portion et tbe boil-shaped iody of the insulator Cap i dee olf seid body im mibstzmtinlly o3,- largely eoiilpletmi during' the bei'einbefoi'e mentioned aboli-expolading operation of the die L and obvioUf-:iy mi@ die mid tbe weile of the envio in tbe die@ abri H eoopeiate in presebo imi-tions; 26 and 2T et tbe pzititioned tbe form desired fol tbe foimation body` as; ebowii in i? 16 and 1S.

tbe shell-expendio operation of 'the lo dies; G omi aire Witi'idmwn from mdefi sbeil to permit removal o1 Said i tbe die H endniembeiz E, and tbe removed Sbeil .in .fm upright po- Ti 'b its summum) end poirtion ippe iiio,.f- :1mi also ebow@ en inwzu'diy projecting mini.' bmgfe 55 formed et tbe ovvel.' end mi on tbe autor seid beii-sbnpeii body. d Simbel' end portion of Farid shell iS trimimw'i und thereby er; :ermiiy Contoured. le mii 'ated by tbe dotted boos at 5G in 1,9

zuid es: @bovin 'in solid lineas in tiggf. Said t zo end portion 25 oit i nsnietion of two lateinibr Spz'ieed, upml'ail'gf projecting; membeifis 5?' eoiiiieetefi :it tbeii ionei.' emi portions by animee@ web@ :mei miti webs fu'e tbe'n eut :Hwy by :t miiiing' 'fooi or otbm'wiee, :1111i tbm be Weinheim IS7 :we p 'Toi-etui, as :it 5S) in 52 amd 23m :les i'equiieti to form upwmab v peojeetiw; ie Kei-ing; eau-f; which Constii''infg connection 'for tbe resultxbed, emp. Y inter Gzip ill s dimmi appli/ce, in Fig. E23, to tb ,bead (571 oit :in S-ubtrw E@ .find Said beet is; contained Withtbe beil-ibepetl body of the cap and Secured ,in pince Within Seid body by Cement (S2 tem tbe 'ienge of tbe cap to and ovei` sait bead.

j ffl l would here remark that my improved process hereinbefore described preferably comprises the Working of a metal tube into the forni of a partitionless shell having two annular ond portions and an intermediate portion, with the end portions unequal diametrically and substantially in line endwise, with the diametrically smaller end portion thicker substantially from end Ato end thereof than the diametrically larger end portion, and with the intermediate portion flaring toward the larger end portion and increased in thickness toward the smaller end portion, and then displacing metal at the interior of the smaller end portion of said shell toward the inner end of said smaller end portion and thereby forming a transverse partition internally of said shell at said inner end of said smaller end portion as required to form a supporting connection as well as preparatory to the diametrical expansion of said shell from said partition to the outer end of the larger end portion of the shell.

What l claim is:

l. In the art of making insulator caps, a process consisting in Working a metal tube into the form of a partitionless shell having end portions which are unequal in diameter, then displacing metal at the interior of the diametrically smaller end portion of said shell toward the inner end of said smaller end portion and thereby forming a transverse partition internally of said shell at said inner end of said smaller end portion, and after the formation of said partition operating on said smaller end portion as required to form a supporting connection, and also diametrically expanding said shell from said partition to the outer end of the diametrical-larger end portion of the shell.

2. ln the art of making insulator caps, a process consisting in Working a metal tube into the forni of a shell which has tubularity from end to eno and tivo annular end portions am, an intern'icdiate portion, with the ond po ,ions unequal diametrically and substa tially in line endvvise, with the diametrically smaller end portion thicker substantially ,trom end to end thereof than thev diametri-cally larger end portion, and with the intermediate portion flaring toward the larger end portion and increased in thickness toward the smaller end portion, and then fg a trai'isverse partition at the inner end of the smaller end portion and internal-- lv ot saiu shell.

n 3, ln. the art of making insulator caps, a process consisting in Working a metal tube into the form of a partitionless shell having end portions which are unequal in diameter', then displacing metal at the interior of the diametrically smaller end portion oi' said shall toward the inner end of said smaller end portion of the shell and thereby effecting the formation, at said inner end of said smaller end portion and internally of said shell, of a transverse partition arranged to constitute a portion of the body of an insulator cap, and after the formation of said partition pressing the diametrically smaller end portion of said shell into the form'of a flattened hollow member havingsubstantially flat opposite portions, and diametrically expanding said shell between said partition and the outer end of the diametrically larger end portion of the shell and operating` on the aforesaid flattened hollow member as required to form a supporting connection for the aforesaid cap.

4;. In the art of making insulator caps, a process consisting in Working a metal tube into the form of a partitionless shell having two annular end portions and an intermediate portion, with the end portions unequal diametrically and substantially in line end- Wise, with the diametrically smaller end portion hot and substantially uniform in thickness from end to end and thicker than the diametrically larger end portion, With the larger end portion substantially uniform in thickness from end to end, and With the intermediate portion heated and increased in thickness tou/'ard the smaller end portion, and then displacing metal from the smaller end portion of said partitionless shell tovvard the inner extremity of said smaller end portion and thereby forging a partition internally of said partitionless shell.

5. In the art of making insulator' caps, a process consisting in Working a hot metal tube into the form of a partitionless shell having two diametrically unequal annular end portions and an annular intermediate portion connecting said end portions together, with the diametrically smaller end portion thicker than the diametrically larger end portion, and With the intermediate portion flaring` toward the larger end portion and increasing in thickness toward the sn'ialler ond portion; then affording support to the internal surface of the intermodale portion ol said shell and to the external surfaces of the intermediate portion and smaller end portion of the shell and, While ali'ording support to said surfaces displacing metal at the interior of said smaller end portion and toward the inner end of said smaller end portion and thereby forming a transverse partition arranged to constitute a portion of thel body ol an insulator cap, and then operating on said smaller end portion as required to form a supporting connection for said cap and diametrically expanding the intermediate and larger end portions of the shell.

6. In the art of making insulator caps, a process consisting in Working a metal tube into the form of a partitionless shell lnwing` end portions which are unequal in diameter, then forging a substantially imperforate transverse partition adjacent the inner end of the diametrically smaller end portion and lll) intomzly ofi said shel and theroby folvmng; :L portion of tho body of :m nsl, aior cap, thon pril/easing tho shell bexveen said partition and the outer ond of the dzrmotrczzlly smal'l'er ond portion of the shell into the form of a flaite-:nod hollow membo having substantially 'nt oppor-utc portions@ and thon imshmg momo@ the form-ation of the body of tho insulator cap and opomting on Said flattened hollow mombor as required to form the desi'ed suppoljting connection for said oop.

n testimony whereof, I sign the 'foregoing specification.

EDNN J. MOLVRIED. 

